Audio unit



FIG. 1 is a front perspective view of the audio unit;

FIG. 2 is a rear perspective view of the audio unit;

FIG. 3 is a front elevation of the audio unit;

FIG. 4 is a rear elevation of the audio unit;

FIG. 5 is a top or plan view of the audio unit;

FIG. 6 is a bottom view of the audio unit; and,

FIG. 7 is a side elevation of the audio unit. 

CLAIM The ornamental design for an audio unit, substantially as shown. 